Variable-voltage electric transformer for cautery and diagnostic work.



No. 815,868. PATENTED MAR. 20, 1906.

E. H. ROLLINSON. VARIABLE VOLTAGE ELECTRIC TRANSFORMER FOR GAUTBRY AND DIAGNOSTIC WORK APPLIOATION FILED JULY 18. 1905.

H1555" InV 'nET W6C 2L (2.;1 a b M RNA/Maw,

j wwzf Aft g5 and Die UNITED STATES PATENT OFFICE.

EARL H. ROLLINSON, ALBANY, NEW YORK.

VARIABLE-VOLTAGE ELECTRIC TRANSFORMER FOR CAUZI'ERY AND DIAGNOSTIC WORK.

Specification of Letters Patent.

Patented March 20, 1906.

Application filed J 11! 18, 1905- Berial No. 270.802.

To all whom it may concern:

Be it known that I, EARL H. ROLLINSON a citizen of the United States of America, an a resident ofthe cit and county of Albany, State of New Yor have invented certain new and useful Improvements in Variable- Voltage Electric Transformers for Cautery gnostic Work, of which the following is a specification.

My invention relates to variable-voltage cautery-transformers; and the object of my inventlonis to produce a secondary current with low voltage which can be varied to any amount large or small and to get a fine variation in the secondary current. I accom lish this object by means of the mechanism 1 lustrated in the accompanying drawings, in which-- 3 Fi ure 1 is a lan. Fig. 2 is a lan of a modified form 0 my invention. ig. 3 is a perspective view of a box inclosing my inventlon.

Similar letters refer to similar parts throughout the several views.

I construct a core A, preferably of laminations of iron, which may be in the form shown in Fig. 1, substantially annular in shape, but having internal polar projections B and 0, about which polar projections are placed the secondary winding D and E. Around the core A, between the polar projections B and C and on each side thereof, I wind a secondary winding F and G, respectively, suitably mounted in the frame suppprting the core A, a movable primary core about which is coiled the primary windin J. The primary core H is built up of iron aminations and is provided with a series of wires K, extending lengthwise of the core and through the same from one side to the other, the wires K short-circuitin upon themselves. To the primary core H, preferably arrange a handle-bar M, suitabl mounted on a spindle m to the core, where y the primary core Hmay be rotated. The wire making t e windin J on the primary core H is connected at {I an 7' to the source of the electric supply. The secondary windings F and G are connected to small diagnostic lamps. (Not shown.) On the secondary windings F and G there are arran ed the connections f f, which connect with t e se ments N in the top of the box, as shown in Fig. 3, and for the purpose of varying the voltage of the light-circuit from F and G the contact-piece O is removed from one segment to the other, the contact-plate P being connected to the terminal R, which is the post or contact to which the lamp-circuit connects. The other terminal S is connected directly to the secondary windings F and G on the seconda core A. The secondary winding on D an E on the polar pro'ections B and C, respectively, are connecte to theterminals T and 1", respectively. The terminals U and U connect with the primary wires 7' and 7'. When the primary core H is .in the position shown in Fig. 1, a full load is generated. The flux set up by the rimar core threads the secondar winding B and on the polar pro'ection an divides and passes equally along t e secondary core toward the opposlte polar iece, completing the magnetic circuit. en the primary core is rotated to ninety degrees, which may be done in either direction, preferably to the ri 'ht, zero voltage is attained across the sccon ary terminals, for the reason that the ma neticflux set up by the primary winding wil pass to the right and left along the secondary core, but will shunt the olar projections B and C, and no voltage will be generated in the secondary winding. @When the primary core occupies any position between that shown in Fig. 1 and the position which it will occupy when rotated ninety degrees, it will in every intermediate position generate a volta e in the secondary winding1 varying and etermined by the degree W ich the primary core is out of the position shown in Fig. 1, in which the ends of the core join the polar projections.

It will be noted that the windings F and G on the secondar core A will be practically unaffected by the rotation of the primary core H, since in whatever position the primary core occupied there will be a magnetic flux through said winding and the voltage of the Winding will be the same. The secondary winding on the polar projections B and C ma be connected either arallel or in series.

he object of placing the series of wires K around the primary core from end to end, as

shown in 'F1 1, and short-circuitin them upon themse ves is to reduce the rein uction o the secondary circuit and to reduce the attractive force between the secondary and primary core. What I claim as my invention, and desire to secure by Letters Patent, is

1. In a variable-voltage cauterytransformer; a laminated iron core two separatelydisposed secondary windings on said core;

ICC

polar projections on said core; windings on.

said polar projections; a rima core mounted to rotate between sai secon any windings and betweensaid polar projections; windings on said primary core, substantially as de-,

scribed.

2. In a variable-voltage cauterytransformer, a core substantially annular in form,

' former {a secondary core, substanti y annular in form; a primary core mounted to rotate. within the secondary core; internal polar pro:- jections on the secondary core;heavy current secondary windings placed on said polar pro.

I former provided with secon'da e secondary windings eing of difl'er- '3 5 jections; separated secondary windings on said secondary core; primary wlndmgs on said primary core; a series of wires extending o at right angles to the'said riniary wires on said primary core; substantially as described. I

4. A variable 'voltage caute transan primary cores; t ent terminal voltage; the heavy current sec-' ondary windings being laced about internal .olar rejections on sai secondary core; the iifht iagnostic placed on a portion 0 the secondary com Act projections; rim on the pnmary core with short-circuited turns placed thereon, substantially at right angles to the primary windings to reduce the induction of the'secondary wmdmgs in the intermsdiate- 45 7 positions of the core, substantially asdescriibedmb N Y k m7hd,

Signs at an- .ew or t t ay of Ju y, 1905. y i EARL H; ROLLINSQN.

Witnesse ERnpsawx W- CAKEBON In P non.

er than the polar 4o 

